FERTILIZATION. 263 
or later the pollenia will be found in contact with the stigma, 
this I find to be invariably the case. 
'The change induced is a dissolution of the mass, and its re- 
solution into its component particles, this is not carried how- 
ever through its ultimate component particles, which remain 
adherent. The pollinulz first applied are those first dissolved. 
'The stigmatic canal now consists of a few loose cells, with, or 
without central nuclei, and a vast number of excessively fine 
threads, these threads passing down the canal are at the origin 
of the placente divided into three bundles, which bifur- 
cate at the apex of the placenta, and run down either 
side, and which are with ease pulled out from these, 
by gentle force. Are thesethe boyaux? this question. I 
cannot determine, by demonstrating their origin with ṣọ sim- 
ple lens, the last are barely demonstratable as they do not exist 
before the application of the masses to the stigma,and as their 
proportion is proportional to the amount of resolution, their 
origin from the granules is assumable. 
Seeing that the rostellum is highly elastic, this is a fair 
question to put, is not the elasticity connected with im- 
pregnation, by being attended with the effect of causing the 
polleniato be dragged into direct communication with the 
stigma? For in this plant we have without aid of our foreign 
agency, the mass gradually disengaged from the anther case, 
and at length lodged on the face of the stigma. 
I have not traced any application of the tubes to the ovula : 
although they are intimately mixed up with them. 
Eulophie sp. Pl. CCLXXXV. Fig. II. 
Sketched from drying specimens from Pushut; the flowers 
in which impregnation is not effected are dried. 
]. Column viewed in front. 
2. Same laid open, the whole canal occupied by exces- 
sively fine tubes, scarcely definable by =; inch lens 
